/*@description:nginx 对 send的接口封装
 *
 *
 *
 *
 *
 *
 *
 *
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>

/*@brief:nginx 对于send的重新封装
 *@para:ngx_connection_t *c :
 *		u_char *buf:待发送的数据
 *		size_t size:待发送数据的长度
 *
 *@return value: 返回的长度
 *
 */
ssize_t ngx_unix_send(ngx_connection_t *c, u_char *buf, size_t size)
{
    ssize_t       n;
    ngx_err_t     err;
    ngx_event_t  *wev;

    wev = c->write; //写事件;


    for ( ;; ) {
        n = send(c->fd, buf, size, 0);
        ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, "send: fd:%d %z of %uz", c->fd, n, size);
        if (n > 0) {
            if (n < (ssize_t) size) {
                wev->ready = 0;
            }
            c->sent += n;
            return n;
        }
		//调用send的异常处理;
        err = ngx_socket_errno;

        if (n == 0) {
            ngx_log_error(NGX_LOG_ALERT, c->log, err, "send() returned zero");
            wev->ready = 0;
            return n;
        }

        if (err == NGX_EAGAIN || err == NGX_EINTR) {
            wev->ready = 0;

            ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, "send() not ready");
            if (err == NGX_EAGAIN) {
                return NGX_AGAIN;
            }
        } else {
            wev->error = 1;
            (void) ngx_connection_error(c, err, "send() failed");
            return NGX_ERROR;
        }
    }
}
